Precision Cold Drawn Tube
Daim ntawv thov tseem ceeb: Tsheb, maus taus, cov khoom siv tub yees, hydraulic qhov chaw, bearings, pneumatic thooj voos kheej kheej, thiab lwm cov neeg siv khoom uas muaj cov kev xav tau siab rau steel yeeb nkab raug, smoothness, huv, thiab txhua yam khoom.
1, Lub ntsiab feature ntawm zoo tib yam seamless steel yeeb nkab yog tias nws tsis muaj welded seam thiab tuaj yeem tiv taus siab dua. Cov khoom tuaj yeem ntxhib heev li-cam khwb cia lossis txias kos qhov chaw.
2, Lub precision txias drawn yeeb nkab yog feem ntau lub puab lub qhov, thiab sab nrauv phab ntsa loj muaj nruj kam rau ua thiab roughness, thiab cov precision yog tsis tshua muaj siab.
Qhov txias brittleness (los yog qis-kub brittleness nyiam) ntawm txias-dov precision ci steel yeeb nkab yog qhia los ntawm toughness-brittleness hloov kub Tc. High purity hlau (0.01% C) muaj Tc ntawm 100C, thiab nws yog kiag li embritted hauv qab no kub. Feem ntau ntawm cov alloying ntsiab nyob rau hauv lub txias-dov precision ci steel yeeb nkab tsa lub toughness-brittle hloov kub ntawm txias-dov precision ci steel yeeb nkab thiab ua rau kom lub siab ntawm txias brittleness. Thaum cov pob txha tawg yog nyob rau hauv chav tsev kub, qhov tawg ntawm qhov txias-dov precision ci steel yeeb nkab yog qhov tawg, thiab thaum nws tawg tawg ntawm qhov kub qis, nws yog qhov tawg tawg.
Yog vim li cas rau qhov kub thiab txias embrittlement ntawm txias-dov precision ci steel yeeb nkab yog:
(1) Thaum cov dislocations generated los ntawm dislocation qhov chaw thaum lub sij hawm deformation yog thaiv los ntawm obstacles (xws li grain ciam teb, qhov thib ob sib npaug), lub zos kev nyuaj siab tshaj lub theoretical zog ntawm lub txias-dov precision ci steel yeeb nkab thiab ua rau microcracks.
(2) Ob peb plugged dislocations tsim ib tug microcrack ntawm lub grain ciam teb.
(3) Cov tshuaj tiv thaiv ntawm qhov kev sib tshuam ntawm ob {110) cov hlua khi ua rau lub cev tsis muaj zog %26lt; 010% 26gt;, uas yog cov kab nrib pleb zoo li microcrack, uas tuaj yeem faib raws {100} cleavage dav hlau (saib daim duab 1b).
Cov yam ntxwv uas ua rau kom txias brittleness ntawm txias-dov precision ci steel kav yog:
(1) Khoom siv dag zog ntxiv dag zog. Phosphorus tsub kom lub toughness-brittle hloov kub qhov muaj zog tshaj; tseem muaj molybdenum, titanium thiab vanadium; thaum cov ntsiab lus qis, nws muaj qhov cuam tshuam me ntsis, tab sis thaum cov ntsiab lus siab, cov ntsiab lus uas ua rau kom lub zog hloov pauv hloov kub yog silicon, chromium thiab tooj liab; txo toughness-brittleness Lub conversion kub yog npib tsib xee, thiab lub toughness-brittle conversion kub yog manganese.
(2) Cov ntsiab lus tsim theem ob. Lub ntsiab tseem ceeb tshaj plaws rau qhov txias brittleness ntawm txias-dov precision ci steel kav nrog theem ob yog carbon. Nrog rau cov ntsiab lus ntawm cov pa roj carbon monoxide nyob rau hauv txias-dov precision ci steel kav, cov ntsiab lus ntawm pearlite nyob rau hauv txias dov precision ci steel kav nce, nrog qhov nruab nrab nce ntawm 1% ntawm cov ntim ntawm pearlite. Qhov kev hloov pauv ntawm qhov toughness-nkig kub nce los ntawm 2.2 ° C ntawm qhov nruab nrab. Daim duab 2 qhia txog cov txiaj ntsig ntawm cov ntsiab lus carbon hauv ferrite-pearlite steel ntawm brittleness. Qhov sib ntxiv ntawm microalloying ntsiab xws li titanium, niobium thiab vanadium yuav tsim dispersed nitrides los yog carbonitrides, ua rau lub toughness-brittle hloov kub ntawm txias-dov precision ci steel kav yuav nce.
(3) Cov qoob loo loj cuam tshuam rau qhov toughness-brittle hloov kub. Raws li cov nplej coarsen, lub toughness-brittle hloov kub nce. Refining cov nplej txo qhov txias brittleness nyiam ntawm txias-dov precision ci steel kav, uas yog ib tug dav siv txoj kev.
